Synthesis, Characterization and Dielectric Properties of BaTiO3 Nanoparticles

Abstract

Barium titanate (BaTiO[Formula: see text] nanoparticles having small tetragonality were prepared via sol–gel technique followed by post-calcinations at 800∘C. The tetragonal phase was confirmed by XRD and TEM measurements. The obtained nanoparticles were quasi-spherical in shape with particle size lying between 30[Formula: see text]nm and 35[Formula: see text]nm, as obtained by TEM. The prepared sample was further characterized by TGA, DSC, FTIR, UV-Vis and PL spectroscopy. The low tetragonality of the obtained nanoparticles accounts for the absence of endothermic–exothermic peak in the DSC curve. The UV-Vis spectrum reveals band gap narrowing and the PL spectrum shows a broad band covering a large part of the visible spectra with the PL intensity maximum at 568[Formula: see text]nm. The dielectric and electrical properties were studied using LCR and Two probe method, and it shows a decrease in the permittivity as well as the tetragonal to cubic phase transition temperature.